return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for H2O (Water)

using model chemistry: CCSD(T)=FULL/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCSD(T)=FULL/6-31G**
 hartrees
Energy at 0K-76.234018
Energy at 298.15K-76.235115
HF Energy-76.022869
Nuclear repulsion energy9.157694
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at CCSD(T)=FULL/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3875 3875        
2 A1 1694 1694        
3 B2 4002 4002        

Unscaled Zero Point Vibrational Energy (zpe) 4785.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4785.8 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at CCSD(T)=FULL/6-31G**
ABC
26.86872 14.58412 9.45307

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/6-31G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.118
H2 0.000 0.757 -0.474
H3 0.000 -0.757 -0.474

Atom - Atom Distances (Å)
  O1 H2 H3
O10.96120.9612
H20.96121.5145
H30.96121.5145

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 103.964
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability